There has also been a recent soar in the number of deportation arrests of people who have already made it into America.

The US immigration and customs enforcement’s “removal” division, which picks up people for deportation, made almost 145,000 arrests – up 25 per cent from the year before.

The numbers give the clearest snapshot yet of Mr Trump’s immigration enforcement policy and suggest his hardline rhetoric is being followed through by the authorities.

Elaine Duke, the acting homeland security secretary, said: “We have clearly seen the successful results of the President’s commitment to supporting the frontline officers and agents of DHS as they enforce the law and secure our borders.